lumbung-calendar-prototype/event_feed.py

#!/bin/python3

#lumbung.space calendar feed generator
#© 2021 roel roscam abbing gplv3 etc

from ics import Calendar  
import requests
import jinja2
import os
import shutil
from slugify import slugify
from natural import date
from event_feed_config import calendar_url, output_dir

cal = Calendar(requests.get(calendar_url).text)

env = jinja2.Environment(
    loader=jinja2.FileSystemLoader(os.path.curdir) 
    )

if not os.path.exists(output_dir):
    os.mkdir(output_dir)

template = env.get_template('event_template.md')

existing_posts = os.listdir(output_dir)


# Dates need to be displayed for the various TZs
# 3 PM Kassel, Germany, 4 PM Ramallah/Jerusalem, Palestina (QoF),
# 8 AM Bogota, Colombia (MaMa), 8 PM Jakarta, Indonesia (Gudskul),
# 1 PM (+1day) Wellington, New Zealand (Fafswag), 9 AM Havana, Cuba (Instar).

tzs = [
	  ('Kassel','Europe/Berlin'),
	  ('Bamako', 'Europe/London'),
	  ('Palestine','Asia/Jerusalem'),
	  ('Bogota','America/Bogota'),
	  ('Jakarta','Asia/Jakarta'),
	  ('Makassar','Asia/Makassar'),
	  ('Wellington', 'Pacific/Auckland')
	  ]


for event in list(cal.events):

	localized_begins =[]
	for i in tzs:
		localized_begins.append( #javascript formatting because of string creation from hell
			'__{}__ {}'.format(
				str(i[0]),
				str(event.begin.to(i[1]).format("YYYY-MM-DD __HH:mm__"))
				)
			)


	event_metadata = {
	'name':event.name,
	'created':event.created.format(),
	'description': event.description,
	'localized_begin': '           '.join(localized_begins), #non-breaking space characters to defeat markdown
	'begin': event.begin.format(),
	'end': event.end.format(),
	'duration': date.compress(event.duration),
	'location': event.location
	}


	if event.uid not in existing_posts: #if there is an event we dont already have, make it
		post_dir = os.path.join(output_dir, event.uid )

		if not os.path.exists(post_dir):
			os.mkdir(post_dir)
		
		with open(os.path.join(post_dir,'index.md'),'w') as f:
			post = template.render(event = event_metadata)
			f.write(post)
			print('created post for', event.name, '({})'.format(event.uid))

	elif event.uid in existing_posts: #if we already have it, update

		existing_posts.remove(event.uid) # create list of posts which have not been returned by the calendar
		#FIXME: An update logic? e.g. exists but creation date is altered.
		print(event.uid, 'already exists')

for post in existing_posts: #remove events that have been deleted 
    print('deleted', post) #rm posts not returned 
    shutil.rmtree(os.path.join(output_dir,post))